I applied through college or university. The process took 1 day. I interviewed at Jane Street (New York, NY) in Feb 2011
Interview
The guy asked a lot of mental math and brainteasers. For the mental math, he had me answer as fast as possible, and afterwards they ask you to bet on your answers. Brainteasers weren't too difficult, just make sure you think out loud. This one was first round on campus, and there will be more phone interviews and an on-site interview.
Interview questions [1]
Question 1
How much would you bet for your answers to be correct.
Initial application and online assessment. Had a first round behavioral interview where they asked me about myself, my experiences, and a couple of brain teasers. The interviewer was very nice.
Phone interviews (at least 3) - questions were of mixed difficulty (some pretty hard) but the interviewers were friendly and they gave helpful hints. Kind of fun - review probability and game-type questions.
I applied online. I interviewed at Jane Street (New York, NY)
Interview
I first applied in google form answer basic questions about me and with that I had to upload my resume and transcript. I don't remember after how long I got an interview time to choose and did my first round of interview.